From 2d6630dda9f7c3df0da956c4644f94342d2bb747 Mon Sep 17 00:00:00 2001
From: Vitaly Takmazov
Date: Wed, 31 Oct 2018 00:13:21 +0300
Subject: Refresh data on path changes

---
 Juick/ViewControllers/MessagesViewController.m | 93 ++++++++++++++------------
 1 file changed, 49 insertions(+), 44 deletions(-)

(limited to 'Juick/ViewControllers/MessagesViewController.m')

diff --git a/Juick/ViewControllers/MessagesViewController.m b/Juick/ViewControllers/MessagesViewController.m
index 6b8fdb7..77406a6 100644
--- a/Juick/ViewControllers/MessagesViewController.m
+++ b/Juick/ViewControllers/MessagesViewController.m
@@ -24,54 +24,52 @@
 @implementation MessagesViewController
 
 -(void) refreshData {
-    [self refreshData:NO];
-}
-
--(void) refreshData:(BOOL)scrollToBottom {
-    self.dataLoading = YES;
-    if (self.messages.count == 0) {
-        [self.tableView reloadData];
-    }
-    [[APIClient sharedClient] pullNextFromPath:self.path params:self.params callback:^(NSArray *next, NSError *err) {
-        if (err) {
-            [User throwUnableToLogin:self];
-            return;
-        }
-        NSArray *newMsgs = next;
-        if ([self isAtTop:self.params]) {
-            [self.messages removeAllObjects];
+    if ([self.path length] > 0) {
+        self.dataLoading = YES;
+        if (self.messages.count == 0) {
             [self.tableView reloadData];
         }
-        NSUInteger oldCount = [self.messages count];
-        if ([self.path isEqualToString:[APIClient threadUrl]]) {
-            NSUInteger lastRid = [((Message *)[self.messages lastObject]).rid unsignedIntegerValue] + 1;
-            NSUInteger count = [next count];
-            if (oldCount > 0) {
-                if (lastRid && lastRid < count) {
-                    newMsgs = [next subarrayWithRange:NSMakeRange(lastRid, count - lastRid)];
-                } else {
-                    return;
+        [[APIClient sharedClient] pullNextFromPath:self.path params:self.params callback:^(NSArray *next, NSError *err) {
+            if (err) {
+                [User throwUnableToLogin:self];
+                return;
+            }
+            NSArray *newMsgs = next;
+            if ([self isAtTop:self.params]) {
+                [self.messages removeAllObjects];
+                [self.tableView reloadData];
+            }
+            NSUInteger oldCount = [self.messages count];
+            if ([self.path isEqualToString:[APIClient threadUrl]]) {
+                NSUInteger lastRid = [((Message *)[self.messages lastObject]).rid unsignedIntegerValue] + 1;
+                NSUInteger count = [next count];
+                if (oldCount > 0) {
+                    if (lastRid && lastRid < count) {
+                        newMsgs = [next subarrayWithRange:NSMakeRange(lastRid, count - lastRid)];
+                    } else {
+                        return;
+                    }
                 }
             }
-        }
-        self.dataLoading = NO;
-        if (self.messages.count == 0) {
-            [self.tableView reloadData];
-        }
-        [self.messages addObjectsFromArray:newMsgs];
-        NSMutableArray *indexPaths = [NSMutableArray new];
-        for (NSUInteger index = oldCount; index <= oldCount + [newMsgs count] - 1; index++) {
-            [indexPaths addObject:[NSIndexPath indexPathForRow:index inSection: 0]];
-        }
-        [self.tableView beginUpdates];
-        [self.tableView insertRowsAtIndexPaths:indexPaths withRowAnimation:NO];
-        [self.tableView endUpdates];
-        [self.refreshControl endRefreshing];
-        if (scrollToBottom) {
-            NSIndexPath *lastRow = [NSIndexPath indexPathForRow:self.messages.count - 1 inSection:0];
-            [self.tableView scrollToRowAtIndexPath:lastRow atScrollPosition:UITableViewScrollPositionBottom animated:NO];
-        }
-    }];
+            self.dataLoading = NO;
+            if (self.messages.count == 0) {
+                [self.tableView reloadData];
+            }
+            [self.messages addObjectsFromArray:newMsgs];
+            NSMutableArray *indexPaths = [NSMutableArray new];
+            for (NSUInteger index = oldCount; index <= oldCount + [newMsgs count] - 1; index++) {
+                [indexPaths addObject:[NSIndexPath indexPathForRow:index inSection: 0]];
+            }
+            [self.tableView beginUpdates];
+            [self.tableView insertRowsAtIndexPaths:indexPaths withRowAnimation:NO];
+            [self.tableView endUpdates];
+            [self.refreshControl endRefreshing];
+            if (self.shouldScrollToBottomOnRefresh) {
+                NSIndexPath *lastRow = [NSIndexPath indexPathForRow:self.messages.count - 1 inSection:0];
+                [self.tableView scrollToRowAtIndexPath:lastRow atScrollPosition:UITableViewScrollPositionBottom animated:NO];
+            }
+        }];
+    }
 }
 
 -(BOOL) isAtTop:(NSDictionary *)params {
@@ -94,6 +92,9 @@
     self.messages = [NSMutableArray array];
     self.refreshControl = [UIRefreshControl new];
     [self.refreshControl addTarget:self action:@selector(refreshData) forControlEvents:UIControlEventValueChanged];
+    [self refreshData];
+    [self addObserver:self forKeyPath:@"path" options:0 context:nil];
+    [self addObserver:self forKeyPath:@"params" options:0 context:nil];
 }
 
 - (void) composePressed {
@@ -132,4 +133,8 @@
     }
 }
 
+- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary<NSKeyValueChangeKey,id> *)change context:(void *)context {
+    [self refreshData];
+}
+
 @end
-- 
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